Remove the spacing between menu bar and contents

* The spacing is already present due to the insets
   of the contents, so there was some extra room
   between the menu and the contents which this
   commit removes.

src/apps/debugger/user_interface/gui/team_window/TeamWindow.cpp

@@ -760,7 +760,7 @@ TeamWindow::_Init()
 {
 	BScrollView* sourceScrollView;
 
-	BLayoutBuilder::Group<>(this, B_VERTICAL)
+	BLayoutBuilder::Group<>(this, B_VERTICAL, 0.0f)
 		.Add(fMenuBar = new BMenuBar("Menu"))
 		.AddSplit(B_VERTICAL, 3.0f)
 			.GetSplitView(&fFunctionSplitView)